Originally posted by Cosmo
Okay, well, I'll add my 2 cents worth...
On a lot of cars (Civics, 240's, Escorts, whatever) a "cold air" intake will help. On a WRX it will not. I'm not an engineer, so I can't give you an exact explaination, but I can tell you that a "cold air" intake will make the injectors work at a higher duty cycle (usually close to 100%) than normal. I have seen on 3 different WRX's, including my own, the difference. Changing back to the stock intake brings the injectors back down to 80-85%. Now, this is with a "cold air" intake.
I have a Perrin short ram intake, which draws air from under the hood. No problems in the last 18,000 miles that it has been on my car.
Now, one last thing.... it's not the temperature of the air that is the problem, supposedly. It is the speed at which the air passes the MAF sensor. On a "cold air" intake it is moving faster than on a short ram intake or the stock intake.
Again, I'm not an engineer, so take it or leave it. I'm just letting everyone know my experiences....
Are you saying that the stock injectors are nearly maxed out stock, and that the increase in air density is so much that the computer has to increase duty cycle by 10-15%?.... I would love it if my cai increased my maf voltage enough to have to increase the duty cycle 10-15%. Do you know how much power that would be from just an intake?